13 C.F.R. § 124.510
(b) Indefinite delivery and indefinite quantity contracts. In order to ensure that the required limitations on subcontracting requirements on an indefinite delivery or indefinite quantity 8(a) award are met by the Participant, the Participant cannot subcontract more than the required percentage to subcontractors that are not similarly situated entities for each performance period of the contract (i.e., during the base term and then during each option period thereafter). However, the contracting officer, in his or her discretion, may require the Participant to meet the applicable limitation on subcontracting or comply with the nonmanufacturer rule for each order.
[81 FR 34260, May 31, 2016]